CN114262975A - Flame-retardant knitted fabric and preparation method thereof - Google Patents
Flame-retardant knitted fabric and preparation method thereof Download PDFInfo
- Publication number
- CN114262975A CN114262975A CN202111639040.7A CN202111639040A CN114262975A CN 114262975 A CN114262975 A CN 114262975A CN 202111639040 A CN202111639040 A CN 202111639040A CN 114262975 A CN114262975 A CN 114262975A
- Authority
- CN
- China
- Prior art keywords
- flame
- retardant
- sericin
- fiber
- polyester fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 239000003063 flame retardant Substances 0.000 title claims abstract description 107
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 239000004744 fabric Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000000835 fiber Substances 0.000 claims abstract description 125
- 229920000728 polyester Polymers 0.000 claims abstract description 103
- 108010013296 Sericins Proteins 0.000 claims abstract description 72
- 229920000742 Cotton Polymers 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000012948 isocyanate Substances 0.000 claims abstract description 28
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 27
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 23
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000004753 textile Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 12
- 229920002334 Spandex Polymers 0.000 claims abstract description 10
- 238000009940 knitting Methods 0.000 claims abstract description 10
- 239000004759 spandex Substances 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims abstract description 7
- 238000009987 spinning Methods 0.000 claims abstract description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 54
- 239000008367 deionised water Substances 0.000 claims description 34
- 229910021641 deionized water Inorganic materials 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 33
- 238000009210 therapy by ultrasound Methods 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 239000004814 polyurethane Substances 0.000 claims description 23
- 229920002635 polyurethane Polymers 0.000 claims description 23
- 239000012266 salt solution Substances 0.000 claims description 23
- 239000000839 emulsion Substances 0.000 claims description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000007935 neutral effect Effects 0.000 claims description 15
- 238000004108 freeze drying Methods 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- -1 aluminum ions Chemical class 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 229910021645 metal ion Inorganic materials 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004472 Lysine Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000004381 surface treatment Methods 0.000 claims description 8
- 239000000084 colloidal system Substances 0.000 claims description 7
- 239000004519 grease Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 5
- 229910001424 calcium ion Inorganic materials 0.000 claims description 5
- 229920004933 Terylene® Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 3
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 3
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- 159000000003 magnesium salts Chemical class 0.000 claims description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims description 2
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910001422 barium ion Inorganic materials 0.000 claims description 2
- 229910001429 cobalt ion Inorganic materials 0.000 claims description 2
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 claims description 2
- 150000001879 copper Chemical class 0.000 claims description 2
- 229910001431 copper ion Inorganic materials 0.000 claims description 2
- 229910001414 potassium ion Inorganic materials 0.000 claims description 2
- 229910001415 sodium ion Inorganic materials 0.000 claims description 2
- 150000003751 zinc Chemical class 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 5
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 239000003607 modifier Substances 0.000 abstract description 3
- 238000007792 addition Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
- D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
- D04B1/18—Other fabrics or articles characterised primarily by the use of particular thread materials elastic threads
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
- D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
- D06M14/08—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials on to materials of synthetic origin
- D06M14/12—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials on to materials of synthetic origin of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M14/14—Polyesters
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Knitting Of Fabric (AREA)
Abstract
The invention discloses a flame-retardant knitted fabric and a preparation method thereof, the flame-retardant knitted fabric is prepared by flame-retardant textile fibers through a knitting process, the flame-retardant textile fibers are prepared by mixing spandex, flame-retardant polyester fibers and flame-retardant cotton fibers according to a weight ratio and then spinning, in the preparation process of the flame-retardant polyester fibers, a layer of sericin protein is attached to the surface of the polyester fibers, the skin-friendly property of the polyester fibers can be improved, the polyester fibers have good air permeability and water conductivity, in the preparation process of the flame-retardant cotton fibers, inorganic salt modified montmorillonite is used as a modifier, isocyanate is used as a grafting agent, and a single crystal sheet of the inorganic salt modified montmorillonite is grafted and fixed on the surface of the cotton fibers, so that the air permeability and water absorption effects of the cotton fibers are not influenced, the inorganic salt modified montmorillonite single crystal sheet can be uniformly grafted to the single crystal sheet of the inorganic salt modified montmorillonite, and the flame-retardant property of the cotton fibers is improved, the whole scheme improves the flame retardant property of the fabric, and does not influence the strength and the skin-friendly property of the fabric.
Description
Technical Field
The invention belongs to the technical field of textiles, and particularly relates to a flame-retardant knitted fabric and a preparation method thereof.
Background
The knitted fabric is a fabric formed by bending yarns into loops by using a knitting needle and interlooping the loops. Knitted fabrics differ from woven fabrics in the form of the yarn in the fabric. The knitting is divided into weft knitting (woven fabric) and warp knitting (warp knitted fabric), and the knitted fabric is widely applied to products such as garment fabric, lining and home textiles and is popular with consumers.
With the development of science and technology and the improvement of living standard, the requirements of people on fabrics are not limited to factors such as shading, strength and the like, wherein, the fire caused by the fabric is a relatively large fire, and meanwhile, most fabrics belong to inflammable goods, the flame-retardant knitted fabric can be used as a flame-retardant substance to further expand the range of fire in the fire, the flame-retardant fabric is promoted by the factor, the knitted fabric has the greatest characteristic of softness and skin friendliness, however, when the flame-retardant fabric is prepared in the prior art, on one hand, the fabric becomes hard, the hand feeling of the fabric is affected, thereby leading the knitted fabric to lose the advantage of softness, on the other hand, part of the flame retardant of the fabric can be separated out in the using process to cause harm to human health, in order to solve the problems, the invention provides a flame-retardant knitted fabric which is soft, safe, reliable and durable in flame-retardant property, and the invention provides the following technical scheme.
Disclosure of Invention
The invention aims to provide a flame-retardant knitted fabric and a preparation method thereof.
The technical problems to be solved by the invention are as follows:
with the development of science and technology and the improvement of living standard, the requirements of people on fabrics are not limited to factors such as shielding and strength, wherein the fire caused by the fabrics is a relatively large fire, meanwhile, most of the fabrics belong to inflammable products, and the fire can be used as a flame retardant substance in the fire to further expand the range of the fire, so that the flame retardant fabrics are promoted by the factors, the maximum characteristic of the knitted fabrics is that the knitted fabrics are soft and skin-friendly, but in the prior art, when the flame retardant fabrics are prepared, on one hand, the fabrics are hardened, the hand feeling of the fabrics is influenced, and the knitted fabrics lose the advantage of softness, and on the other hand, part of flame retardants of the fabrics can be separated out in the using process to cause harm to human health.
The purpose of the invention can be realized by the following technical scheme:
a flame-retardant knitted fabric is prepared by processing flame-retardant textile fibers by a knitting process;
the flame-retardant textile fiber comprises spandex, flame-retardant polyester fiber and flame-retardant cotton fiber which are mixed and spun into the flame-retardant textile fiber;
the weight percentage of spandex in the flame-retardant textile fiber is 1-3%, the weight percentage of the flame-retardant cotton fiber is 15-40%, and the rest is flame-retardant polyester fiber;
the preparation method of the flame-retardant polyester fiber comprises the following steps:
s11, preparing polyurethane emulsion with a solid content of 12% -17%, adding polyester fibers into deionized water, carrying out ultrasonic treatment for 10-20min at a frequency of 30-60KHz to obtain polyester fiber dispersion liquid, then maintaining the frequency of 30-60KHz to carry out ultrasonic treatment on the polyurethane emulsion, adding the polyester fiber dispersion liquid into the polyurethane emulsion, continuing to maintain the ultrasonic frequency for 10-20min after the polyurethane emulsion is completely added, taking out the polyester fibers, draining, and drying at a temperature of 65-75 ℃ to obtain pretreated polyester fibers;
the mass ratio of solid to liquid in the polyester fiber dispersion liquid is 1: 6-8;
the volume ratio of the terylene dispersion liquid to the polyurethane emulsion is 1: 1-2.3;
s12, preparing a sodium hydroxide solution with the mass concentration of 3% -16%, heating to 60-75 ℃, adding the pretreated polyester fiber, carrying out heat preservation treatment for 8-20min, taking out the pretreated polyester fiber, washing the pretreated polyester fiber with deionized water until the surface is neutral, and drying at the temperature of 60-80 ℃ to obtain the alkali-reduction treated polyester fiber;
s13, adding maleic anhydride into N, N-dimethylformamide, mixing, stirring and dissolving, adding the alkali decrement treated polyester fiber obtained by the step S12 into the mixture, heating and reacting at the temperature of 90-110 ℃ for 3 hours, washing with deionized water, washing with acetone, draining, and drying at the temperature of 40-48 ℃ to obtain grafted polyester fiber for later use;
through heating reflux reaction, maleic anhydride is grafted and fixed on the surface of the polyester fiber, so that carboxyl is introduced on the surface of the polyester fiber;
in the steps S11-S13, firstly, polyester fibers are added into polyurethane emulsion for ultrasonic treatment, and are heated and dried, a layer of polyurethane particles is fixed on the surfaces of the polyester fibers, then alkali reduction treatment is carried out on the polyester fibers, a layer of rough surface structure can be formed on the surfaces of the polyester fibers due to the protection effect of the polyurethane particles, and then the polyester fibers are treated by maleic anhydride solution, so that active groups such as carboxyl groups are grafted on the surfaces of the polyester fibers, and the rough surface structure is favorable for attachment of subsequent sericin proteins;
s14, adding sericin into deionized water, mixing uniformly to enable sericin to absorb water fully, freeze-drying the sericin, adding the freeze-dried sericin into the deionized water for rehydration, freeze-drying the sericin after water absorption to enable rich pore channel structures to be formed in the sericin, preparing a metal salt solution with the molar concentration of 0.04-0.13mol/L, adding the porous sericin into the metal salt solution, enabling the addition amount of the porous sericin in the metal salt solution to be 7-14g/100mL, stirring and dispersing uniformly, carrying out ultrasonic treatment for 10-15min under the condition of 60-120KHz, stirring and reacting for 1.5-2.5h at the temperature of 25-40 ℃, filtering and taking out the porous sericin, washing the porous sericin with deionized water to be neutral, and drying at the temperature of 35-40 ℃, obtaining the modified sericin.
The metal ions in the metal salt solution are one or a mixture of at least two of potassium ions, calcium ions, sodium ions, zinc ions, aluminum ions, copper ions, cobalt ions and barium ions in any ratio;
s15, adding the modified sericin prepared in the step S14 into N, N-dimethylformamide, mixing and dispersing, adding isocyanate, stirring and dissolving, adding the grafted polyester fiber prepared in the step S13, carrying out ultrasonic treatment for 10-25min, raising the reaction temperature to 65-80 ℃, reacting for 2.5-3h, filtering and taking out the fiber, and drying at 50-65 ℃ to obtain the flame-retardant polyester fiber.
In steps S14 to S15, a porous structure is formed inside sericin by repeated freeze-drying treatment, and then the porous sericin obtained by the treatment is added into a metal salt solution, so that metal ions on the metal salt solution are grafted on the surface of the porous sericin, wherein both the sericin and the metal ions grafted on the surface of the sericin have good flame retardant effect, and meanwhile, a layer of sericin is attached to the surface of the polyester fiber, so that the skin affinity of the polyester fiber can be improved, and the polyester fiber has good air permeability and water conductivity.
The isocyanate is lysine isocyanate, toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate;
the preparation method of the flame-retardant cotton fiber comprises the following steps:
s21, adding the cotton fiber into a sodium carbonate aqueous solution, boiling for 10-15min at 65-85 ℃, removing colloid, grease and partial impurities on the surface of the cotton fiber, wherein the pH value of the sodium carbonate aqueous solution is 8.5-9, filtering, washing the cotton fiber with deionized water until the surface is neutral, and drying at 60-75 ℃ to obtain surface-treated cotton fiber;
s22, adding inorganic salt modified montmorillonite into N, N-dimethylformamide, carrying out ultrasonic treatment for 15-25min under the condition of 40-80KHz frequency to obtain inorganic salt modified montmorillonite dispersion liquid, then adding isocyanate, stirring and dissolving, adding the surface treatment cotton fiber obtained in the step S21, carrying out ultrasonic treatment at 20-80KHz frequency to uniformly disperse the surface treatment cotton fiber in the N, N-dimethylformamide, heating to 65-80 ℃, carrying out heat preservation treatment for 3-5h, filtering, and drying at 60-75 ℃ to obtain the flame-retardant cotton fiber.
The isocyanate is lysine isocyanate, toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate;
the modified inorganic salt of the inorganic salt modified montmorillonite is aluminum salt, zinc salt, copper salt or magnesium salt;
in the step, firstly, the cotton fiber is subjected to alkali treatment, so that colloid, grease and other impurities on the surface of the cotton fiber are removed, the dispersibility of the cotton fiber in subsequent treatment is facilitated, the surface cleanliness of the cotton fiber is improved, then, inorganic salt modified montmorillonite is used as a modifier, isocyanate is used as a grafting agent, and the single crystal sheet of the inorganic salt modified montmorillonite is grafted and fixed on the surface of the cotton fiber, so that the air permeability and water absorption effects of the cotton fiber are not influenced, and the inorganic salt modified montmorillonite single crystal sheet can be uniformly grafted to the single crystal sheet of the inorganic salt modified montmorillonite, and the flame retardant property of the cotton fiber is improved.
The invention has the beneficial effects that:
the flame-retardant knitted fabric is prepared by processing flame-retardant textile fibers by a knitting process, wherein the flame-retardant textile fibers are prepared by mixing spandex, flame-retardant polyester fibers and flame-retardant cotton fibers according to a weight ratio and then spinning; then through repeated freeze drying treatment, the inside of sericin is enabled to generate a porous structure, then the porous sericin obtained through the treatment is added into a metal salt solution, metal ions on the metal salt solution are grafted on the surface of the porous sericin, wherein the sericin and the metal ions grafted on the surface of the sericin have good flame retardant effect, meanwhile, a layer of sericin is attached to the surface of the polyester fiber, the skin affinity of the polyester fiber can be improved, the polyester fiber has good air permeability and water conductivity, in the preparation process of the flame retardant cotton fiber, firstly, the cotton fiber is subjected to alkali treatment, so that impurities such as colloid, grease and the like on the surface of the cotton fiber are removed, thereby being beneficial to the dispersibility of the cotton fiber in subsequent treatment and improving the surface cleanliness of the cotton fiber, then, inorganic salt modified montmorillonite is used as a modifier, and isocyanate is used as a grafting agent, the inorganic salt modified montmorillonite single crystal wafer is grafted and fixed on the surface of the cotton fiber, so that the air-permeable and water-absorbing effect of the cotton fiber is not influenced, the inorganic salt modified montmorillonite single crystal wafer can be uniformly grafted, the flame retardant property of the cotton fiber is improved, and the strength and the skin-friendly property of the fabric are not influenced while the flame retardant property of the fabric is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation method of the flame-retardant knitted fabric is characterized by comprising the following steps of:
firstly, respectively preparing flame-retardant polyester fibers and flame-retardant cotton fibers;
step two, uniformly mixing the flame-retardant polyester fiber, the flame-retardant cotton fiber and spandex according to a certain weight ratio, and spinning to prepare the flame-retardant textile fiber;
thirdly, taking the flame-retardant textile fiber as a raw material, and processing the raw material by a knitting process to obtain a flame-retardant knitted fabric;
the weight percentage of spandex in the flame-retardant textile fiber is 2%, the weight percentage of the flame-retardant cotton fiber is 35%, and the rest is the flame-retardant polyester fiber;
the preparation method of the flame-retardant polyester fiber comprises the following steps:
s11, preparing a polyurethane emulsion with a solid content of 16%, adding polyester fibers into deionized water, carrying out ultrasonic treatment for 15min at a frequency of 40KHz to obtain a polyester fiber dispersion liquid, then maintaining the frequency of 50KHz to carry out ultrasonic treatment on the polyurethane emulsion, adding the polyester fiber dispersion liquid into the polyurethane emulsion, continuing maintaining the ultrasonic frequency for treatment for 16min after the polyurethane emulsion is completely added, taking out the polyester fibers, draining, and drying at a temperature of 70 ℃ to obtain pretreated polyester fibers;
the mass ratio of solid to liquid in the polyester fiber dispersion liquid is 1: 7;
the volume ratio of the terylene dispersion liquid to the polyurethane emulsion is 1: 1.8;
s12, preparing a sodium hydroxide solution with the mass concentration of 6%, heating to 65 ℃, adding the pretreated polyester fiber into the sodium hydroxide solution, carrying out heat preservation treatment for 12min, taking out the pretreated polyester fiber, washing the pretreated polyester fiber with deionized water until the surface of the polyester fiber is neutral, and drying at 65 ℃ to obtain alkali-reduction treated polyester fiber;
s13, adding maleic anhydride into N, N-dimethylformamide, mixing, stirring and dissolving, adding the alkali decrement treated polyester fiber obtained by the step S12 into the mixture, heating and reacting at 100 ℃ for 3 hours, washing with deionized water, washing with acetone, draining, and drying at 45 ℃ to obtain grafted polyester fiber for later use;
s14, adding sericin into deionized water, uniformly mixing to enable sericin to fully absorb water, freeze-drying the sericin, adding the freeze-dried sericin into the deionized water for rehydration, freeze-drying the sericin after water absorption to enable rich pore channel structures to be formed in the sericin, preparing a metal salt solution with the molar concentration of 0.07mol/L, adding porous sericin into the metal salt solution, enabling the addition amount of the porous sericin in the metal salt solution to be 11g/100mL, uniformly stirring and dispersing, carrying out ultrasonic treatment for 10min under the condition of 90KHz, stirring and reacting for 2h at the temperature of 30 ℃, filtering to take out the porous sericin, washing with deionized water to be neutral, and drying at the temperature of 40 ℃ to obtain the modified sericin.
The metal ions in the metal salt solution are calcium ions;
s15, adding the modified sericin prepared in the step S14 into N, N-dimethylformamide, mixing and dispersing, adding isocyanate, stirring and dissolving, adding the grafted polyester fiber prepared in the step S13, carrying out ultrasonic treatment for 16min, raising the reaction temperature to 75 ℃, reacting for 3h, filtering and taking out the fiber, and drying at the temperature of 60 ℃ to obtain the flame-retardant polyester fiber.
The isocyanate is lysine isocyanate;
the preparation method of the flame-retardant cotton fiber comprises the following steps:
s21, adding the cotton fiber into a sodium carbonate aqueous solution, boiling for 15min at the temperature of 70 ℃, removing colloid, grease and partial impurities on the surface of the cotton fiber, wherein the pH value of the sodium carbonate aqueous solution is 8.5-9, then filtering, washing the cotton fiber with deionized water until the surface is neutral, and then drying at the temperature of 70 ℃ to obtain surface-treated cotton fiber;
s22, adding inorganic salt modified montmorillonite into N, N-dimethylformamide, carrying out ultrasonic treatment for 20min under the condition of 60KHz to obtain inorganic salt modified montmorillonite dispersion liquid, then adding isocyanate, stirring and dissolving, adding the surface treatment cotton fiber obtained in the step S21, carrying out ultrasonic treatment at the frequency of 60KHz to uniformly disperse the surface treatment cotton fiber in the N, N-dimethylformamide, heating to 70 ℃, carrying out heat preservation treatment for 4h, filtering, and drying at the temperature of 65 ℃ to obtain the flame-retardant cotton fiber.
The isocyanate is lysine isocyanate;
the modified inorganic salt of the inorganic salt modified montmorillonite is a magnesium salt.
Example 2
The preparation method of the flame-retardant knitted fabric is characterized by comprising the following steps of:
firstly, respectively preparing flame-retardant polyester fibers and flame-retardant cotton fibers;
step two, uniformly mixing the flame-retardant polyester fiber, the flame-retardant cotton fiber and spandex according to a certain weight ratio, and spinning to prepare the flame-retardant textile fiber;
thirdly, taking the flame-retardant textile fiber as a raw material, and processing the raw material by a knitting process to obtain a flame-retardant knitted fabric;
the weight percentage of spandex in the flame-retardant textile fiber is 2.5 percent, the weight percentage of the flame-retardant cotton fiber is 15 to 40 percent, and the rest is the flame-retardant polyester fiber;
the preparation method of the flame-retardant polyester fiber comprises the following steps:
s11, preparing a polyurethane emulsion with a solid content of 16%, adding polyester fibers into deionized water, carrying out ultrasonic treatment for 15min at the frequency of 40KHz to obtain a polyester fiber dispersion liquid, then maintaining the frequency of 40KHz to carry out ultrasonic treatment on the polyurethane emulsion, adding the polyester fiber dispersion liquid into the polyurethane emulsion, continuing maintaining the ultrasonic frequency treatment for 15min after the polyurethane emulsion is completely added, taking out the polyester fibers, draining, and drying at the temperature of 70 ℃ to obtain pretreated polyester fibers;
the mass ratio of solid to liquid in the polyester fiber dispersion liquid is 1: 6.5;
the volume ratio of the terylene dispersion liquid to the polyurethane emulsion is 1: 1.8;
s12, preparing a sodium hydroxide solution with the mass concentration of 8%, heating to 65 ℃, adding the pretreated polyester fiber into the sodium hydroxide solution, carrying out heat preservation treatment for 14min, taking out the pretreated polyester fiber, washing the pretreated polyester fiber with deionized water until the surface of the polyester fiber is neutral, and drying at 70 ℃ to obtain alkali-reduction treated polyester fiber;
s13, adding maleic anhydride into N, N-dimethylformamide, mixing, stirring and dissolving, adding the alkali decrement treated polyester fiber obtained by the step S12 into the mixture, heating and reacting at 105 ℃ for 3 hours, washing with deionized water, washing with acetone, draining, and drying at 42 ℃ to obtain grafted polyester fiber for later use;
s14, adding sericin into deionized water, uniformly mixing to enable sericin to fully absorb water, freeze-drying the sericin, adding the freeze-dried sericin into the deionized water for rehydration, freeze-drying the sericin after water absorption to enable rich pore channel structures to be formed in the sericin, preparing a metal salt solution with the molar concentration of 0.10mol/L, adding porous sericin into the metal salt solution, enabling the addition amount of the porous sericin in the metal salt solution to be 9g/100mL, uniformly stirring and dispersing, carrying out ultrasonic treatment for 12min under the condition of 80KHz, stirring and reacting for 2.5h at the temperature of 30 ℃, filtering and taking out the porous sericin, washing the porous sericin with deionized water to be neutral, and drying at the temperature of 40 ℃ to obtain the modified sericin.
The metal ions in the metal salt solution are calcium ions;
s15, adding the modified sericin prepared in the step S14 into N, N-dimethylformamide, mixing and dispersing, adding isocyanate, stirring and dissolving, adding the grafted polyester fiber prepared in the step S13, carrying out ultrasonic treatment for 15min, raising the reaction temperature to 70 ℃, reacting for 3h, filtering and taking out the fiber, and drying at the temperature of 55 ℃ to obtain the flame-retardant polyester fiber.
The isocyanate is lysine isocyanate;
the preparation method of the flame-retardant cotton fiber comprises the following steps:
s21, adding the cotton fiber into a sodium carbonate aqueous solution, boiling for 15min at the temperature of 75 ℃ to remove colloid, grease and partial impurities on the surface of the cotton fiber, wherein the pH value of the sodium carbonate aqueous solution is 8.5-9, filtering, washing the cotton fiber with deionized water until the surface is neutral, and drying at the temperature of 75 ℃ to obtain surface-treated cotton fiber;
s22, adding inorganic salt modified montmorillonite into N, N-dimethylformamide, carrying out ultrasonic treatment for 20min under the condition of 50KHz to obtain inorganic salt modified montmorillonite dispersion liquid, then adding isocyanate, stirring and dissolving, adding the surface treatment cotton fiber obtained in the step S21, carrying out ultrasonic treatment at the frequency of 60KHz to uniformly disperse the surface treatment cotton fiber in the N, N-dimethylformamide, heating to 70 ℃, carrying out heat preservation treatment for 4h, filtering, and drying at the temperature of 65 ℃ to obtain the flame-retardant cotton fiber.
The isocyanate is lysine isocyanate;
the modified inorganic salt of the inorganic salt modified montmorillonite is aluminum salt.
Comparative example 1
The preparation method of the flame-retardant polyester fiber comprises the following steps:
s11, preparing a sodium hydroxide solution with the mass concentration of 6%, heating to 65 ℃, adding polyester fibers into the sodium hydroxide solution, carrying out heat preservation treatment for 12min, taking out the polyester fibers, washing the polyester fibers with deionized water until the surfaces of the polyester fibers are neutral, and drying at the temperature of 65 ℃ to obtain alkali-reduction treated polyester fibers;
s12, adding maleic anhydride into N, N-dimethylformamide, mixing, stirring and dissolving, adding the alkali decrement treated polyester fiber obtained by the step S11 into the mixture, heating and reacting at 100 ℃ for 3 hours, washing with deionized water, washing with acetone, draining, and drying at 45 ℃ to obtain grafted polyester fiber for later use;
s13, adding sericin into deionized water, uniformly mixing to enable sericin to fully absorb water, freeze-drying the sericin, adding the freeze-dried sericin into the deionized water for rehydration, freeze-drying the sericin after water absorption to enable rich pore channel structures to be formed in the sericin, preparing a metal salt solution with the molar concentration of 0.07mol/L, adding porous sericin into the metal salt solution, enabling the addition amount of the porous sericin in the metal salt solution to be 11g/100mL, uniformly stirring and dispersing, carrying out ultrasonic treatment for 10min under the condition of 90KHz, stirring and reacting for 2h at the temperature of 30 ℃, filtering to take out the porous sericin, washing with deionized water to be neutral, and drying at the temperature of 40 ℃ to obtain the modified sericin.
The metal ions in the metal salt solution are calcium ions;
s14, adding the modified sericin prepared in the step S13 into N, N-dimethylformamide, mixing and dispersing, adding isocyanate, stirring and dissolving, adding the grafted polyester fiber prepared in the step S12, carrying out ultrasonic treatment for 16min, raising the reaction temperature to 75 ℃, reacting for 3h, filtering and taking out the fiber, and drying at the temperature of 60 ℃ to obtain the flame-retardant polyester fiber.
The isocyanate is lysine isocyanate;
other conditions were the same as in comparative document 1.
Comparative example 2
The preparation method of the flame-retardant cotton fiber comprises the following steps:
s21, adding the cotton fiber into a sodium carbonate aqueous solution, boiling for 15min at 70 ℃, removing colloid, grease and partial impurities on the surface of the cotton fiber, wherein the pH value of the sodium carbonate aqueous solution is 8.5-9, then filtering, washing the cotton fiber with deionized water until the surface is neutral, and then drying at 70 ℃ to obtain the surface-treated cotton fiber.
Other conditions were the same as in comparative document 1.
Analysis of Experimental data and results
The flame retardant knitted fabrics in examples 1 to 2 and comparative examples 1 to 2 were tested for flame retardancy (GB8410-2006), hand feeling, and elongation at break (sample size 170mm x 40mm, test speed 200mm/min), and the specific results are shown in table 1;
TABLE 1
From the results, the flame-retardant knitted fabric has a good flame-retardant effect, a large tensile elongation and a soft hand feeling.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (8)
1. The preparation method of the flame-retardant knitted fabric is characterized by comprising the following steps of:
firstly, respectively preparing flame-retardant polyester fibers and flame-retardant cotton fibers;
step two, uniformly mixing the flame-retardant polyester fiber, the flame-retardant cotton fiber and spandex according to a certain weight ratio, and spinning to prepare the flame-retardant textile fiber;
thirdly, taking the flame-retardant textile fiber as a raw material, and processing the raw material by a knitting process to obtain a flame-retardant knitted fabric;
the preparation method of the flame-retardant polyester fiber comprises the following steps:
s11, preparing polyurethane emulsion with a solid content of 12% -17%, adding polyester fibers into deionized water, carrying out ultrasonic treatment for 10-20min at a frequency of 30-60KHz to obtain polyester fiber dispersion liquid, then maintaining the frequency of 30-60KHz to carry out ultrasonic treatment on the polyurethane emulsion, adding the polyester fiber dispersion liquid into the polyurethane emulsion, continuing to maintain the ultrasonic frequency for 10-20min after the polyurethane emulsion is completely added, taking out the polyester fibers, draining, and drying at a temperature of 65-75 ℃ to obtain pretreated polyester fibers;
s12, preparing a sodium hydroxide solution with the mass concentration of 3% -16%, heating to 60-75 ℃, adding the pretreated polyester fiber, carrying out heat preservation treatment for 8-20min, taking out the pretreated polyester fiber, washing the pretreated polyester fiber with deionized water until the surface is neutral, and drying at the temperature of 60-80 ℃ to obtain the alkali-reduction treated polyester fiber;
s13, adding maleic anhydride into N, N-dimethylformamide, mixing, stirring and dissolving, adding the alkali decrement treated polyester fiber obtained by the step S12 into the mixture, heating and reacting at the temperature of 90-110 ℃ for 3 hours, washing with deionized water, washing with acetone, draining, and drying at the temperature of 40-48 ℃ to obtain grafted polyester fiber for later use;
s14, adding sericin into deionized water, mixing uniformly to ensure that the sericin fully absorbs water, freeze-drying, adding the freeze-dried sericin into deionized water for rehydration, then freeze-drying the sericin after water absorption to obtain porous sericin, preparing a metal salt solution with the molar concentration of 0.04-0.13mol/L, adding the porous sericin, wherein the adding amount of the porous sericin in the metal salt solution is 7-14g/100mL, stirring and dispersing uniformly, ultrasonic processing for 10-15min under the condition of 60-120KHz, then stirring and reacting for 1.5-2.5h at the temperature of 25-40 ℃, filtering and taking out the porous sericin, washing the porous sericin to be neutral by using deionized water, and drying the porous sericin at the temperature of 35-40 ℃ to obtain modified sericin;
s15, adding the modified sericin prepared in the step S14 into N, N-dimethylformamide, mixing and dispersing, adding isocyanate, stirring and dissolving, adding the grafted polyester fiber prepared in the step S13, carrying out ultrasonic treatment for 10-25min, raising the reaction temperature to 65-80 ℃, reacting for 2.5-3h, filtering and taking out the fiber, and drying at 50-65 ℃ to obtain the flame-retardant polyester fiber.
2. The preparation method of the flame-retardant knitted fabric according to claim 1, wherein the flame-retardant textile fiber comprises 1-3 wt% of spandex, 15-40 wt% of flame-retardant cotton fiber, and the balance of flame-retardant polyester fiber.
3. The method for preparing the flame-retardant knitted fabric according to claim 1, wherein in step S11, the mass ratio of solid to liquid in the polyester fiber dispersion liquid is 1: 6-8; the volume ratio of the terylene dispersion liquid to the polyurethane emulsion is 1: 1-2.3.
4. The method for preparing the flame-retardant knitted fabric according to claim 1, wherein the metal ions in the metal salt solution are one or a mixture of at least two of potassium ions, calcium ions, sodium ions, zinc ions, aluminum ions, copper ions, cobalt ions and barium ions in any ratio.
5. The preparation method of the flame-retardant knitted fabric according to claim 1, wherein the preparation method of the flame-retardant cotton fiber comprises the following steps:
s21, adding the cotton fiber into a sodium carbonate aqueous solution, boiling for 10-15min at 65-85 ℃, removing colloid, grease and partial impurities on the surface of the cotton fiber, wherein the pH value of the sodium carbonate aqueous solution is 8.5-9, filtering, washing the cotton fiber with deionized water until the surface is neutral, and drying at 60-75 ℃ to obtain surface-treated cotton fiber;
s22, adding inorganic salt modified montmorillonite into N, N-dimethylformamide, carrying out ultrasonic treatment for 15-25min under the condition of 40-80KHz frequency to obtain inorganic salt modified montmorillonite dispersion liquid, then adding isocyanate, stirring and dissolving, adding the surface treatment cotton fiber obtained in the step S21, carrying out ultrasonic treatment at 20-80KHz frequency to uniformly disperse the surface treatment cotton fiber in the N, N-dimethylformamide, heating to 65-80 ℃, carrying out heat preservation treatment for 3-5h, filtering, and drying at 60-75 ℃ to obtain the flame-retardant cotton fiber.
6. The method for preparing a flame retardant knitted fabric according to claim 5, wherein the isocyanate is one of lysine isocyanate, toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate.
7. The method for preparing flame-retardant knitted fabric according to claim 5, wherein the modified inorganic salt of the inorganic salt modified montmorillonite is one of aluminum salt, zinc salt, copper salt or magnesium salt.
8. A flame-retardant knitted fabric characterized by being manufactured by the manufacturing method according to any one of claims 1 to 7.
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